[Equest-users] Appendix G. supply fan power and altitude adjustment

[Bishop, Bill]

Nick,

Thanks for forwarding the previous post - I should've searched the
archives first.

I see merits to both schools of thought. My preference for now will be
to set project altitude to zero. The air flow and fan power reported in
SV-A will be consistent with the calculated/entered value for baseline
fan power (in kW/cfm).

Bill

 

From: Nick Caton [mailto:ncaton at smithboucher.com] 
Sent: Tuesday, May 17, 2011 6:13 PM
To: Bishop, Bill; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Appendix G. supply fan power and altitude
adjustment

 

Hey Bill,

 

These altitude shenanigans eQuest likes to play in the airflow/coil
calculations are a potentially messy issue when it comes to baseline
calcs and LEED reviewers.  

 

Attached thread pretty much covers the issue inside and out from
multiple perspectives.

 

There are a 2 schools of thought:

1.       Set project altitude to '0' - this corrects all airflows, but
you'll find coil capacities are sized slightly differently (this has
been a working approach for LEED reviewers in my experience)... 

2.       Divide all entered airflows by the altitude factor for the
project (listed on those system reports).  A more cumbersome solution,
but I gather this will correctly trick eQuest into doing the intuitive
thing with regard to airflow/coil sizing.

 

My sense is this is one of those things fundamental to DOE-2 that won't
easily change, but I've said before - it would be a great 'feature' to
add in future releases to have an option to treat all entered capacities
are relative to the site elevation, instead of sea level.

 

~Nick

 

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

Smith & Boucher Engineers

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bishop,
Bill
Sent: Tuesday, May 17, 2011 2:49 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Appendix G. supply fan power and altitude
adjustment

 

The supply cfm reported in SV-A is corrected for altitude, but the fan
power on the same report is for sea level. So if, for example, you enter
0.0003 kW/cfm for Appendix G Baseline System 1 and 2 fan power, the SV-A
reported fan power is low relative to the SV-A flow rate. (This was
noticed in a LEED review and I was asked to verify the fan power
calculations.)

 

Can/should I be multiplying the baseline fan power allowance by the
altitude factor (also reported on SV-A)?

 

Thanks,

Bill

 

 

 

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